Finding the Fourth Proportional to 20,131.42, 30,185.33 and 13,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,131.42 : 30,185.33 = 13,475.50 : x
2. Step 2: Convert to fraction form
   20,131.42/30,185.33 = 13,475.50/x
3. Step 3: Cross multiply
   20,131.42x = 30,185.33 × 13,475.50
4. Step 4: Simplify right side
   20,131.42x = 406,762,196.11
5. Step 5: Solve for x
   x = 406,762,196.11/20,131.42
6. Step 6: Final answer
   x = 20,205.35